Method and device for cooling an electric machine
a technology of electric machines and cooling rotors, which is applied in the direction of dynamo-electric machines, electrical apparatus, cooling/ventilation arrangements, etc., can solve the problems of not as grave as expected disadvantages of reverse-flow cooling, and achieve the effects of reducing rotation, improving fan outflow, and improving cooling
Inactive Publication Date: 2012-02-02
ERHARD JOHANNES
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Benefits of technology
The reverse-flow cooling system with external fans effectively reduces pressure losses, conserves materials, and enhances cooling efficiency, making it viable for salient-pole machines by minimizing temperature differences and optimizing air gap utilization, thus improving overall generator performance and reducing costs.
Problems solved by technology
The cooling system disclosed herein is a solution that has not been considered so far, disproves the prevailing prejudices and yields the surprising result that when using external fans, the expected disadvantages of reverse-flow cooling are not as grave as is normally feared or that these disadvantages are more than compensated by the advantages arising from this very application.
Despite this, this major disadvantage is also compensated by the above-named advantage, so that reverse-flow cooling with external fans can also be used in salient-pole machines.
Method used
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[0019]The present invention is described in the following using salient pole generators as an example. FIG. 1 shows a part of the well-known casing 2 of a bulb turbine, in which a generator 1 is arranged. For this purpose, a rotor 3 is fixed to one end of a shaft 7 running in bearings, so that the rotor 3 turns together with the shaft 7. On the other end of shaft 7 and outside casing 2, a well-known turbine (not shown here), for instance, a Kaplan turbine, is mounted, which drives the shaft 7 and therefore also the generator 1.
[0020]The rotor 3 comprises a hub spider 8, which is fixed on the shaft 7 and on which the rotor winding 5 is arranged in the known manner. A generator 1 of a bulb turbine is typically a slow-running machine and has a rotor 3 with salient-pole winding, which will be further detailed in respect of FIG. 2.
[0021]The stator 4 is fixed to a supporting structure 9 in casing 2 at a distance from casing 2 and co-axially around rotor 3. It is provided with stator windi...
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In a slowly-running electric machine, such as a bulb turbine generator, air circulation for cooling is supplied by externally driven fans. A cooling device is mounted on the pressure or the suction side of the fan and the rotor and the stator are mounted on the suction side of the fan.
Description
CROSS RELATED APPLICATION[0001]This application is a divisional of application Ser. No. 12 / 306,112 filed Sep. 21, 2009 which is a U.S. national phase of International Application No. PCT / AT2007 / 000300 filed 20 Jun. 2007 which designated the U.S. and claims priority to Austrian Patent Application 1061-2006 filed Jun. 22, 2006, the entire contents of each of which are hereby incorporated by reference.BACKGROUND[0002]The subject invention relates to a device and a process for the cooling of a stator and a rotor of an electric machine, where a gaseous cooling medium is circulated in a ventilation circuit by means of an externally driven fan.[0003]In air-cooled generators, we differentiate basically between a so-called forward-flow and a reverse-flow cooling system, that is, on principle, according to the direction of flow of the cooling air through the generator. In forward-flow cooling, cold cooling air is extracted from heat exchangers with fans and pressed through the rotor, respecti...
Claims
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IPC IPC(8): H02K9/12
CPCH02K9/12H02K1/32
InventorHARB, WALTERERHARD, JOHANNESFARNLEITNER, ERNST
OwnerERHARD JOHANNES